| US 7,616,070 B2 | ||
| Electronic oscillators having a plurality of phased outputs and such oscillators with phase-setting and phase-reversal capability | ||
| Nestor Tzartzanis, Belmont, Calif. (US); and William W. Walker, Los Gatos, Calif. (US) | ||
| Assigned to Fujitsu Limited, Kawasaki (Japan) | ||
| Filed on Nov. 05, 2007, as Appl. No. 11/934,998. | ||
| Application 11/934998 is a continuation of application No. 11/347460, filed on Feb. 03, 2006, granted, now 7,307,483. | ||
| Prior Publication US 2008/0061896 A1, Mar. 13, 2008 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. H03B 27/00 (2006.01) | ||
| U.S. Cl. 331—57 [331/45; 327/296; 327/274] | 20 Claims |
| 1. A multiphase electronic oscillator comprising:
a loop of a first plurality of delay stages, the first plurality of delay stages being serially coupled to one another by
a first plurality of nodes, the loop being folded to provide two concentric rings of delay stages;
a plurality of negative-resistance elements, each element having a first output coupled to a node on the first concentric
ring and a second output coupled to a node on the second concentric ring, each output of each negative-resistance element
being capable of presenting a negative resistance to a signal coupled to the output;
a control chain of a second plurality of delay stages, the second plurality of delay stages being serially-coupled to one
another by a second plurality of nodes; and
a plurality of control circuits, each control circuit having an input coupled to a node of the control chain, each control
circuit being coupled to at least a node of the loop or a negative-resistance element and causing the resistance seen at a
node of the loop to be modified in relation to a signal at its input.
|